09-01-2017 | Remy van Elst
This snippet shows you how to use haproxy to restrict certain URLs to certain IP addresses. For example, to make sure your admin interface can only be accessed from your company IP address.
This snippet was tested on haproxy 1.5.
This snippet is tested on a Digital Ocean VPS. If you like this snippet and want to support me, plus get free credit @ DO, use this link to order a Digital Ocean VPS: https://www.digitalocean.com/?refcode=7435ae6b8212
This example restricts access to the
/helpdesk URL's. It only allows access from the IP addresses
18.104.22.168. Any other IP addresses will get the standard haproxy 403 forbidden error.
It uses the acl option. If the requested path begins with either
/helpdesk haproxy sets the
restricted_page acl. haproxy also looks at the requesting source IP address. If that matches any of the two IP addresses, it sets the
network_allowed acl. If the
allowed_network acl is set and the
restricted_page is also set, it allows a visitor to go to the page. If the
restricted_page acl is set but the
allowed_network is not, haproxy will serve a 403 error, thus, disallowing access to that specific URL.
Note that you can use IP addresses but also networks in the
src acl. Both
frontend example-frontend [...] acl network_allowed src 22.214.171.124 126.96.36.199 acl restricted_page path_beg /admin acl restricted_page path_beg /helpdesk block if restricted_page !network_allowed [...]
To use a specific file as error page, use the following config in the defaults section:
defaults [...] errorfile 400 /etc/haproxy/errors/400.http errorfile 403 /etc/haproxy/errors/403.http errorfile 408 /etc/haproxy/errors/408.http errorfile 500 /etc/haproxy/errors/500.http errorfile 502 /etc/haproxy/errors/502.http errorfile 503 /etc/haproxy/errors/503.http errorfile 504 /etc/haproxy/errors/504.http
http files are regular HTML files with a HTTP response on top, like so:
HTTP/1.0 403 Forbidden Cache-Control: no-cache Connection: close Content-Type: text/html <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>403 Forbidden</title> </head><body> <h1>Forbidden</h1> <p>You don't have permission to access this area on this server.</p> <hr> <address>Apache/2.4.12 (Ubuntu) Server at example.org Port 443</address> </body></html>
This is the default apache error page.
** update 2017-01-09 **
If you have a non-http service you want to restrict to a few IP's you can use an ACL together with the
tcp-request connection reject optio. Here below is a simple example for a MySQL service. Do note that this also works in a
listen mysql bind 188.8.131.52:3306 mode tcp acl network_allowed src 184.108.40.206 220.127.116.11/27 tcp-request connection reject if !network_allowed server mysqlvip 10.0.0.30:3306